Grinding wheel dresser



Aug- 26, 1958 J. c. POTTER 2,848,989

GRINDING WHEEL DRESSER Filed April 18. 1957 sskf 31 5/ ze 1a 2L 21 z, HO 5 13 Ari j 3:27 v zo -mmmmm y l l (je 54 36C 1D IZ j] 7 e 22' aINVENTOR.

F|G 4 I7 15 14M, JACK C. POTTER BY TTM/QA ATTORNEY GRINDING WHEELDRESSER Jack CaPotter, St. Louis, Mo. Application April 18,1951, seria-1N6. 653,636 .5 claims. (c1. 12s- 11) This invention relates in generalto grinding wheel dressers and, more particularly, to a ,grinding wheeldresser adapted to be mounted on va surface grinding machine frarne forydressing the angle of the edge of the grinding wheel during operationthereof.

Heretofore, various types of dressers have 'been developed either fordressing the angle of a grinding Wheel or for truing same, but the useof such has consistently 4necessitated temporary discontinuance `ofproductive operation of the machine, `with -removal of the work, whileangle dressing is-efected, since such dressers must be specially mounted"for use. Obviously, the same have proved 'most costly in practice, asthe ltime consumed for mounting and dismounting, aswell `as operation,markedly 'reduces the effective productive operating time of thegrinding wheel and also 4involves the non-productive services Iof theoperator during such interval.

Thus it is an object ofthe present invention to provide an angle dresserwhich may be mounted `upon ythe frame of a lgrinding machine in 4suchposition so as to lpermit continuous or intermittent dressing ofthewheel while the same is engaged in grinding operations whereby angledressing will not necessitate loss of time from production ordisturbance of the work.

It is another object ofthe present invention to provide `an angledresser which is capable of dressing a grinding 'wheel through a rangeoli-substantially 45 degrees.

A further object of the. present invention is to provide an 4angledresser which is integrated with a protective shield adapted fordetachable engagement `upon a grind- -ingfmachineg and which will`prevent 'injury to the operator from removed particles of abrasive.

it is another object of the present invention to provide an angledresser which is adapted for adjustment for accommodating grindingwheels of varying diameters.

An additional object of the present invention is to provide an angledresser Lhaving a carriage adapted for smooth, sliding travel along `thedresser frame to assure 4easy positionment th'erealong Another object ofthe present invention is to provide an angle dresser for grindingAwheels which may be most economically manufactured; which is durableand reliable in usage; which comprises a simplicity of parts; and which`may be easily operated.

These and other detailed objects are obtained by the structuresillustrated in the 'accompanying drawing in whichj Figure 1 is a frontview of anangle dresser constructed ,in accordance with .and embodyingthe present invention illustrating the same as mounted upon kthe frameof a .grinding machine. j

Figure 2 is a `top plan view-of the angle dresser Vtaken along the :line2--2 of Figure l.

`Figure 3 -is -a front view of the .angle Jdresser as .detached from thegrinding machine.

Figure 4 is a vertical transverse `.section taken lon Athe ,line 4-4 ofvFigure 2.

nited States Patent Olice '2,848,989 Patented Aug. 26, 1958 Figure 5 isa vertical transverse section taken on the line 5-5 of Figure '3.

Referring now by reference characters to the drawing which illustratesthe preferred embodiment of the present invention, A designatesgenerally a conventional grinding .machine having a frame with arecessed portion within which is Vrotatably mounted a grinding wheel 1;there being the usual bed 2for .supporting work w. Provided fordetachable securement upon the frame of machine A, as -by means ofretaining screws s, in covering relation to the recess containing wheelV1 is a plate-like shield o r closure 3. 'In mounted position vthe lowermargin of shield 3 will be spaced upwardly of the lower edge of wheel 1and is downwardly inclined toward one end for extension at an angle to,and below, the transverse center line of wheel v1 `for reasons presentlyappearing. On the lower portion of 'the outer face of shield 3, forincorporation therewith as a composite unit, is presented a grindingwheel angle dresser B which comprises an elongated frame portionconsisting of .a side member 4 'having its lower edge in `alignment withthe lower edge of shield `3, being maintained spacedly outwardly fromshield 3 by a pair of parallel end members 5, 6 rigid at their innerends on shield 3. Formed in shield 3 is an enlarged vopening 7 havingits transverse ,axis parallel with the lower edge of shield 3; with thebottom margin of opening 7 being aligned with the upper surface of sidemember 4.

End members 5, .6, side member 4, `and the portion of shield 3 oppositesaid side member 4 define an elongated opening 8 within which `isdisposed a carriage C for slideable movement therein. Carriage Cincorporates a central slide `body 9 having preferably polished lateralsurfaces for sliding engagement with the adjacent inner faces of sidemember 4 and shield 3.; the upper surface of slide `body 9 is inalignment with the upper surface of side member 4. Secured, as by screwsd, to the under portion of slide body 9 is a base plate 10 extendinglaterally beneath the lower surfaces of .side member 4 and shield 3 withwhich the adjacent upper face portions of plate 10 are in contact.Substantially intermediate its length slide body 9 is vprovided with anupwardly opening cylindrical recess 11 for receiving a complementarypivot 12 (Figure 5) depending from the under surface of a top block 13disposed for rotative movement upon slide body 9. An adjusting screw 14Vprojects upwardly through aligned openings 15, 16 in base plate 10 andslide body 9, respectively, for extension into recess 11 for threaded:engagement Within a tapped opening 17 in pivot 11 for permitting, uponloosening, rotation of ,top block 13 with respect to slide body 9., andfor maintaining, upon tightening, :said block 13 in selected, .rotatedposition; it being noted that block 13 may extend through shieldAopening 7 .duri-ng rotation.

I n .its upper surface .top block 13 is provided with a dove-tail orundercut groove 18 forming a guideway one side of which is defined by`an adjustment plate 19 secured to top block 13 by .set screws 20regulated threading of which allows 4positioning of said .adjustmentplate 19 toward and away .from block 13 for reasons presentedhereinbelow, Slideably disposed within groove 18 is a dressing-.pointcarrier 21 having lateral beveled faces as at 22, 22 for engagement withthe sides of said Agroove 18 and at its outer end is drilled as at23 forreception of .the inner end of a handle 24 .by which an operator maycause carrier 21 to be ,slidingly moved'reciprocally within `groove 18.A t its inner end tcarrier 21 .mounts a rod-like point holder 25,axially .aligned with handle .24 and .ca-rrier 21, which supportsadjacent ,its outer end and on .its lateral 'face the customary dressing`tool or ldiamondpoint 26. By adjustment .of set screws20 the pressureagainst the sides of dressing-point carrier 21 may be varied therebypermitting predetermined control of the rate of the stroke by which theoperator moves carrier Z1.

Normally the inner end portion of carrier 21 and point-holder 25 willproject inwardly through shield opening 7 for presenting point 26 to theperipheral surface of wheel 1 for dressing or trimming same to thedesired angle of bevel by reciprocatory movement imparted by theoperator to carrier 21.

Disposed on the upper surface of top block 13 to one side of carrier 21is a dial or gauge 27 (see Figure 2) having markings graduated thereon,as by inscription, from Zero to forty ve for indicating the bevel angleto -be formed on wheel 1. Secured to base plate 10 is the lower,inturned end of an indicating finger or pointer 28 which projectsupwardly, outwardly of side member 4, for cooperation with dial 27 forestablishing top block 13 in proper position for development of thedesired angle on wheel 1. Thus, if, for example, the working edge ofwheel 1 is to be dressed to a 3() degree' angle, top block 13 will berotated, consequent to loosening of screw 14, so that the thirty markeron dial 27 is aligned with, and immediately adjacent, pointed 28.Thereupon adjusting screw 14 is secured to maintain block 13 in suchselected position and reciprocal movement of carrier 21 is then effectedby hand with a bevel having an angle of 30 degrees being reliablyimparted to wheel 1.

Carriage C may be moved longitudinally of the frame of angle dresser B,for accommodation of wheels of varying diameter, by means of a screw 29threadedly received within a tapped opening 30 in end member 6, havingon its outer end a handle or a knob 31 and being at its inner endtapered as at 32 for reception within a shallow recess 33 formed in theconfronting end face of slide body 9 of carriage C. Against the oppositeend face `of carriage C there bears one end of a compression spring 34,the opposite end of which abuts against the inner face of end member 5;guide projections 35, 36 being provided on slide body 9 and end member5, respectively, for preventing axial displacement of spring 34. Saidspring 34 thus resists movement of carriage C pursuant to inwardthreading of screw 29 and assures return travel of said carriage uponreverse operation of screw 29.

In view of the foregoing, it is to be particularly observed that angledresser B is so integrated with shield 3 for constituting an element ofmachine A and is so disposed as to permit dressing of the periphery ofwheel 1 during operation thereof upon work w, thus obviating any needwhatever for temporary discontinuance of the operation with theattendant costliness in loss of labor and machine time as has beencustomary with angle dressers heretofore.

Work w is not disturbed during the angle dressing operation and anoperator utilizing grinding machine A may either continuously orintermittently, as necessary, dress the angle of wheel 1 to assure thatthe particular cut being made in work w is uniform.

Carriage C is designed and especially constructed for even travel alongthe angle dresser frame as by the character of the engaging surfaces andthe lack of positive engagement with screw 29 so that the wob'bling,uneven eiect brought about in the current use of screw shafts threadedlysecured to carriages is avoided. Furthermore, the angle dresser B is setat an angle to the transverse center line of grinding wheel 1 so thatdiamond point 26 will reliably engage said wheel at a point upon its'transverse center line whereby proper contact is assured for effectingthe requisite bevel. Thus, angle dresser B is disposed with respect tothe horizontal at a predetermined angle to compensate for the heightthereof for bringing about efficient operation of point 25. Dial surface27 is presented as a component of angle dresser B and is located forready viewing by the 'operator so that the indicated adjustment may besimply done to result in the proper bevel. Shield 3 provides necessaryprotection so that particles of abrasives being removed by the dressing,4 operation will not injure the operator. The angle dresser of thepresent invention thus has a marked simplicity of parts so that the samemay be economically manufactured and will be durable and reliable inusage; and which is presented to a wheel for facile use and withoutdisturbance to the work or the operation thereon.

it should be understood that changes and modications in the formation,construction, arrangement and combination of the several parts of thegrinding wheel dresser may be made and substituted for these hereinshown and described without departing from the nature and principle ofmy invention.

Having thus described my -invention, what I claim and desire to secureby Letters Patent is:

1. An angle dresser for grinding wheels having a frame, a rotatablymounted grinding wheel, and a work support bed comprising a plate-likeshield for disposition coveringly over the outer upper portion of saidgrinding wheel, the bottom edge of said shield being spaced upwardlyfrom the work support bed and extending along a line downwardly inclinedwith respect to the transverse center line of the grinding wheel, anangle dresser frame comprising a side member disposed outwardly of saidshield with its bottom margin aligned with the bottom margin of saidshield, a pair of parallel end members engaged to the ends of said sidemember and to said shield whereby said end members, said side member,and the portion of the shield opposite side member define an elongatedopening, a carriage disposed in said opening for sliding movement fromend to end thereof, means for effecting movement of said carriage, a topblock pivotally mounted on said carriage, for rotation within a planeparallel to the upper surface of said side member, said top block havinga guideway formed in its upper surface, a point carrier slideablydisposed in said groove for reciprocal movement therealong, a pointholder projecting from the inner end of said point carrier, a pointprovided on the outer end portion of said point holder, said shieldhaving an opening, said point holder projecting through the opening insaid shield for presenting the point to the periphery of the grindingwheel, and means for maintaining said top block in selected rotatedposition for addressing said point to the grinding wheel for effectingthe desired degree of bevel thereon.

2. An angle dresser for grinding wheels having a frame, a rotatablymounted grinding wheel, and a work support bed comprising a plate-likeshield for disposition coveringly over the outer, upper portion of saidgrinding Wheel, the bottom edge of said shield being spaced upwardlyfrom the work support bed and extending along a line being downwardlyinclined with respect to the transverse center line of the grindingwheel, an angle dresser frame comprising a side member disposedoutwardly of said shield with its bottom margin aligned with the bottommargin of said shield and a pair of parallel end members engaged to theends of said side member and to said shield, whereby said end members,said side member and the portion of said shield opposite side memberdefine an elongated opening, a carriage disposed in said opening forsliding movement from end to end thereof, means for effecting movementof said carriage, a top block pivotally mounted on said carriage forrotative movement in a plane parallel to the upper surface of the sidemember, said top block having a guideway formed in its upper surface, apoint carrier disposed in said groove for reciprocal movementtherealong, means for adjusting the width of said guideway forcontrolling the rate of movement of the point carrier therein, a pointholder projecting from the inner end of said point carrier in axialalignment therewith, a point provided on the outer end portion of saidpoint holder, said shield having an opening, said point holderprojecting through the opening in said shield for presenting the pointto the periphery of the grinding wheel, and

means for maintaining said top block in selected rotated position foraddressing said point to the grinding wheel for effecting the desireddegree of bevel thereon.

3. An angle dresser as described in claim 2 wherein a dial havinggraduated markings is provided on the upper surface of said top block,and an indicator `is xed on said carriage for cooperation with the dialsurface.

4. An angle dresser for grinding wheels having a frame and a rotatablymounted grinding wheel, comprising a plate-like shield for dispositioncoveringly over the outer upper portion of said grinding wheel, thebottom edge of said shield extending along a line downwardly inclinedwith respect to the transverse center line of the grinding wheel, anangle dresser frame axially parallel to the bottom edge of said shield,comprising a Side member disposed outwardly of said shield, a pair ofend members engaged to the ends of said side member and to said shieldwhereby said end members, said side member, and the portion of theshield opposite said side member de fme an elongated opening, a carriageydisposed in said opening for sliding movement from end to end thereof,means for eiecting movement of said carriage, a top block pivotallymounted on said carriage,

a point carrier slideably carried from said top block for axialreciprocal movement, a point holder provided on said point carrier, apoint provided on said point holder, said shield having an opening, saidpoint holder projecting through the opening in said shield forpresenting the point to the periphery of the grinding wheel.

5. An angle dresser as described in claim 4 wherein means are providedfor maintaining said top block in selected rotated position for dressingthe point to the grinding wheel for effecting the desired degree ofbevel thereon, a dial having graduated markings is provided on the uppersurface of said top block for indicating the degree of bevel, and anindicator is xed on said carriage for cooperation with the dial surface.

References Cited in the le of this patent UNITED STATES PATENTS1,350,044 Stryhal Aug. 17, 1920 1,508,939 Reeves Sept. 16, 19241,596,701 Williams Aug. 17, 1926 2,209,228 Judge July 23, 1940

